CN1951624A - Method for changing blade in machine for large-scale boiler draught fan - Google Patents
Method for changing blade in machine for large-scale boiler draught fan Download PDFInfo
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- CN1951624A CN1951624A CN 200610131645 CN200610131645A CN1951624A CN 1951624 A CN1951624 A CN 1951624A CN 200610131645 CN200610131645 CN 200610131645 CN 200610131645 A CN200610131645 A CN 200610131645A CN 1951624 A CN1951624 A CN 1951624A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 241000251468 Actinopterygii Species 0.000 claims abstract description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims description 51
- 230000002787 reinforcement Effects 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005476 soldering Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
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Abstract
The invention relates to a method for replacing the blades of exhauster of large boiler. Wherein, it first uses carbon arc gas to cut the work surface, fish head round steel and strengthen bar of one opposite blades, to grind and clean the cutting surface; uses the non-work surface of said group as reference, positions the mould between front and back discs to weld one group of preformed work surfaces synchronously; cuts off the non-work surface of former work surface, and welds new non-work surface on the strengthen bar. The invention has low cost, short time, and wide application.
Description
Technical field
The invention belongs to the maintenance method of boiler induced-draft fan in the power system.
Background technology
Thermal power plant mainly is fuel with the fire coal, owing to contain the grit of some in the flue gas of boiler emission, ubiquity draught fan impeller wear problems because draught fan impeller wearing and tearing or dust stratification vibration cause unit to be exerted oneself by forced landing even unplanned stoppage in transit, influences safety and economic operation.
Solve wear problem, often adopt soldering or topped abrasionproof backplate or at blade and hub disk position easy to wear build-up wear-resistant material at position easy to wear; Serious need are changed impeller.In practice, because above-mentioned several its construction technologies of anti-wear way are all complicated, except that blade soldering and built-up welding scuff-resistant coating, other technology is generally all carried out in manufactory.Impeller also need carry out dynamic and static balance correction after repairing.In the process of dismounting impeller, need to remove the air-introduced machine insulation, with the air-introduced machine casing take apart, bearing block disintegrates.Both waste material, lost labor again.Simultaneously, because the time between overhauls(TBO) is long, strengthened shutdown loss.
Summary of the invention
The invention provides a kind of method of changing blade in machine for large-scale boiler draught fan, to solve at present when impeller is repaired, because impeller integral body is carried out the complex process that dismounting exists, both waste material, lost labor again; Time between overhauls(TBO) is long, has strengthened the problem of shutdown loss.The technical scheme that the present invention takes is: comprise the following steps:
One, the casing that keeps the impeller outside, impeller shaft bearing and bearing are broken away from, at first adopt carbon arc air gouging to cut working face, a fish round steel and the reinforcement of relative one group of blade in 12 blades simultaneously, after the cutting, use the channel-section steel identical to support this position, for the second time with forward and backward dish spacing, cut separately another of this group blade more equally and organize relative blade, support equally, relative blade is organized in same more for the third time cutting separately another of cut-off blade for the second time, supports equally;
Two, cut surface is polished, cleaning, with the non-working surface of relative one group of blade respectively as benchmark, utilize mould to be positioned at and weld one group of new working face between shroud and hub disk respectively simultaneously, the one side of this mould is consistent with the shape of non-working surface, another side is consistent with the shape of new working face, connect by link in the middle of two faces of this mould, new working face comprises, working face, a fish round steel and reinforcement, and it is made in advance, during welding two-sided welding is carried out in the junction between working face and shroud and the hub disk, and junction between two-sided welding reinforcement and shroud and the hub disk, so the new working face with all the other two groups of relative blades welds;
Three, adopt carbon arc air gouging to continue the non-working surface that six blades of former working face have been removed in cutting, also adopt in twos one group relatively, cutting simultaneously respectively separately, after all having cut, new non-working surface plug welding is received the reinforcement place of new working face, the weld of non-working surface and reinforcement has long fabrication hole, and with non-working surface two ends and shroud and hub disk welding, during welding, non-working surface both sides bevelling, make when welding can the single-sided welding two-sides forming, adopt in twos one group relatively, welding separately;
Four, welding abrasionproof backplate on Yu Touchu, working face and the non-working surface of new blade;
Five, repeat above-mentioned steps one～four, all the other six blades are changed.
The present invention also comprises:
Six, after blade all welds, carry out built-up welding Fe-05 abrasionproof and handle.
The experience that the present invention uses and makes according to fan operation has been invented and has not been taken the air-introduced machine casing apart, do not dismantled draught fan impeller, directly changes the method for impeller blade in the air-introduced machine casing.When organizing to blade, can be with the forward and backward dish of impeller location, organize working face and non-working surface respectively to blade, when the assembly welding blade, can guarantee the equal full weld in working face both sides, before the non-working surface welding, should open long fabrication hole at the weld of non-working surface and stiffener, so that after non-working surface welds, weld with reinforcement again, strengthened blade integral rigidity.Simultaneously, when non-working surface welds, guarantee the single-sided welding double-faced forming, guaranteed the reliability of the integral solder of blade.
For preventing when removing old blade, to cause the impeller bulk deformation, adopt carbon arc air gouging to cut, and carry out the excision of front side of vane and inoperative respectively.Should hocket with the new front side of vane of welding when cutting former blade working face, keep the blade non-working surface earlier, and utilize the non-working surface location, weld fresh processed blade in situ.Simultaneously, symmetry is carried out the cutting and the welding of blade at interval, whenever cuts a slice blade, supports this position with channel-section steel, with anti-deformation, after prescinding 6 relative blades, is about to the in place and welding of new blade; After 6 new blades weld, cut other 6 blades again, the in place and welding with new vane group is noted simultaneously and should symmetry be cut, and is symmetrically welded.
When carrying out the impeller reparation,, before constructing, in advance bearing block and bearing are broken away from, and it is separated with electro-insulating rubber for preventing damage blower fan axle and bearing in the impeller welding process.
Before the new blade welding, bevelling, and guarantee the single-sided welding two-sides forming; Before the new blade wear strip welding, should bore welding process hole earlier by drawing; New blade protects before slot welding connects, and should guarantee that its molded lines conforms to the blade round steel.
After blade all welds, carry out built-up welding Fe-05 abrasionproof and handle.
Impeller carries out the dynamic and static balance correction of on-the-spot impeller after all repairing.
The invention has the advantages that: maintenance duration is short, recondition expense is low, maintenance is effective, be expected to be able to promotion and application well on the similar subsidiary engine with other of large-sized boiler air-introduced machine, so and the economic benefit and the social benefit of creation will be considerable.
Description of drawings
Fig. 1 is that shroud hub disk blade arrangement of the present invention concerns schematic diagram;
Fig. 2 is the cutaway view of the A-A of Fig. 1 of the present invention;
Fig. 3 is the structural representation of the ready made new working face of the present invention, a fish round steel and reinforcement;
Fig. 4 is the structural representation of new working face of the present invention and non-working surface, and wherein non-working surface and reinforcement carry out plug welding by long fabrication hole 9 places;
Fig. 5 is the abrasionproof backplate that is welded on the new working face, bores welding process hole on it;
Fig. 6 is a fish abrasionproof backplate;
Fig. 7 is the abrasionproof backplate that is welded on the non-working surface.
The specific embodiment
One, the casing that keeps the impeller outside, impeller shaft bearing and bearing are broken away from, at first adopt carbon arc air gouging to cut working face, a fish round steel and the reinforcement of relative one group of blade in 12 blades simultaneously, after the cutting, use the channel-section steel identical to support this position, for the second time with forward and backward dish spacing, cut separately another of this group blade more equally and organize relative blade, support equally, relative blade is organized in same more for the third time cutting separately another of cut-off blade for the second time, supports equally; Referring to Fig. 1, at first adopt working face, a fish round steel and the reinforcement of carbon arc air gouging while cut-off blade 1 and blade 1 ', working face, a fish round steel and the reinforcement of while second time cut-off blade 3 and blade 3 ', working face, a fish round steel and the reinforcement of while cut-off blade 5 and blade 5 ' for the third time;
Two, cut surface is polished, cleaning, with the non-working surface of relative one group of blade respectively as benchmark, utilize mould to be positioned at and weld one group of new working face between shroud and hub disk respectively simultaneously, the one side of this mould is consistent with the shape of non-working surface, another side is consistent with the shape of new working face, connect by link in the middle of two faces of this mould, new working face comprises, working face, a fish round steel and reinforcement, and it is made in advance, referring to Fig. 3, during welding two-sided welding is carried out in the junction between working face and shroud and the hub disk, and junction between two-sided welding reinforcement and shroud and the hub disk, so the new working face with all the other two groups of relative blades welds;
Three, adopt carbon arc air gouging to continue the non-working surface that six blades of former working face have been removed in cutting, also adopt in twos one group relatively, cutting simultaneously respectively separately, after all having cut, new non-working surface plug welding is received the reinforcement place of new working face, the weld of non-working surface and reinforcement has long fabrication hole 9, and with non-working surface two ends and shroud and hub disk welding, during welding, non-working surface both sides bevelling, make when welding can the single-sided welding two-sides forming, adopt in twos one group relatively, welding separately; Referring to Fig. 2, Fig. 4;
Four, welding abrasionproof backplate on Yu Touchu, working face and the non-working surface of new blade; Abrasionproof backplate on new working face bores welding process hole on it; Referring to Fig. 5, Fig. 6, Fig. 7.
Five, repeat above-mentioned steps one～four, all the other six blades are changed, promptly change blade 2 and 2 ', 4 and 4 ', 6 and 6 '.
The present invention also comprises:
Six, after blade all welds, carry out built-up welding Fe-05 abrasionproof and handle.
Claims (2)
1, a kind of method of changing blade in machine for large-scale boiler draught fan comprises the following steps:
One, the casing that keeps the impeller outside, impeller shaft bearing and bearing are broken away from, at first adopt carbon arc air gouging to cut working face, a fish round steel and the reinforcement of relative one group of blade in 12 blades simultaneously, after the cutting, use the channel-section steel identical to support this position, for the second time with forward and backward dish spacing, cut separately another of this group blade more equally and organize relative blade, support equally, relative blade is organized in same more for the third time cutting separately another of cut-off blade for the second time, supports equally;
Two, cut surface is polished, cleaning, with the non-working surface of relative one group of blade respectively as benchmark, utilize mould to be positioned at and weld one group of new working face between shroud and hub disk respectively simultaneously, the one side of this mould is consistent with the shape of non-working surface, another side is consistent with the shape of new working face, connect by link in the middle of two faces of this mould, new working face comprises, working face, a fish round steel and reinforcement, and it is made in advance, during welding two-sided welding is carried out in the junction between working face and shroud and the hub disk, and junction between two-sided welding reinforcement and shroud and the hub disk, so the new working face with all the other two groups of relative blades welds;
Three, adopt carbon arc air gouging to continue the non-working surface that six blades of former working face have been removed in cutting, also adopt in twos one group relatively, cutting simultaneously respectively separately, after all having cut, new non-working surface plug welding is received the reinforcement place of new working face, the weld of non-working surface and reinforcement has long fabrication hole, and with non-working surface two ends and shroud and hub disk welding, during welding, non-working surface both sides bevelling, make when welding can the single-sided welding two-sides forming, adopt in twos one group relatively, welding separately;
Four, welding abrasionproof backplate on Yu Touchu, working face and the non-working surface of new blade;
Five, repeat above-mentioned steps one～four, all the other six blades are changed.
2, the method for changing blade in machine for large-scale boiler draught fan according to claim 1, the present invention also comprises:
Six, after blade all welds, carry out built-up welding Fe-05 abrasionproof and handle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610131645 CN100484690C (en) | 2006-11-17 | 2006-11-17 | Method for changing blade in machine for large-scale boiler draught fan |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610131645 CN100484690C (en) | 2006-11-17 | 2006-11-17 | Method for changing blade in machine for large-scale boiler draught fan |
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| Publication Number | Publication Date |
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| CN1951624A true CN1951624A (en) | 2007-04-25 |
| CN100484690C CN100484690C (en) | 2009-05-06 |
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| CN 200610131645 Active CN100484690C (en) | 2006-11-17 | 2006-11-17 | Method for changing blade in machine for large-scale boiler draught fan |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915247A (en) * | 2010-08-30 | 2010-12-15 | 湖北赛福机械有限公司 | Production method of steel blade of counter rotating axial main fan |
| CN103079750A (en) * | 2010-06-22 | 2013-05-01 | 索尔维公司 | Method for welding metallic blades |
| CN103624380A (en) * | 2013-11-13 | 2014-03-12 | 中国神华能源股份有限公司 | Method for repairing front delivery channel of continuous miner |
| CN103722296A (en) * | 2013-11-22 | 2014-04-16 | 瓮福（集团）有限责任公司 | Repairing method for blade abrasion of high-temperature warm air machine |
| CN105127663A (en) * | 2015-08-24 | 2015-12-09 | 武汉理工大学 | Remanufacturing technology for pulverizer exhauster impeller of boiler |
| CN105252202A (en) * | 2015-09-24 | 2016-01-20 | 共享铸钢有限公司 | Repair welding reworking method for crack defects of flange disc casting with rib plate |
| CN105328396A (en) * | 2015-11-26 | 2016-02-17 | 沈阳黎明航空发动机(集团)有限责任公司 | Blade replacement and repair method for stator blade assemblies of gas compressors |
| CN105643183A (en) * | 2015-12-24 | 2016-06-08 | 甘肃银光化学工业集团有限公司 | Method for repairing fracture of liquid ring type compressor impeller under strong acid working condition |
| CN105945508A (en) * | 2016-06-27 | 2016-09-21 | 攀钢集团工程技术有限公司 | Online repairing method for impeller of circulating fan |
| CN109014458A (en) * | 2018-09-21 | 2018-12-18 | 贵州凯阳航空发动机有限公司 | A kind of cutting method of aircraft engine blade |
| CN114083224A (en) * | 2021-11-26 | 2022-02-25 | 国网四川省电力公司映秀湾水力发电总厂 | Repair method for fixed guide vane of mixed-flow water turbine |
| CN114918628A (en) * | 2022-06-20 | 2022-08-19 | 江苏金通灵鼓风机有限公司 | Manufacturing method of large closed tungsten carbide abrasion-proof impeller |
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2006
- 2006-11-17 CN CN 200610131645 patent/CN100484690C/en active Active
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103079750A (en) * | 2010-06-22 | 2013-05-01 | 索尔维公司 | Method for welding metallic blades |
| CN101915247A (en) * | 2010-08-30 | 2010-12-15 | 湖北赛福机械有限公司 | Production method of steel blade of counter rotating axial main fan |
| CN103624380A (en) * | 2013-11-13 | 2014-03-12 | 中国神华能源股份有限公司 | Method for repairing front delivery channel of continuous miner |
| CN103722296A (en) * | 2013-11-22 | 2014-04-16 | 瓮福（集团）有限责任公司 | Repairing method for blade abrasion of high-temperature warm air machine |
| CN103722296B (en) * | 2013-11-22 | 2015-11-18 | 瓮福（集团）有限责任公司 | A kind of restorative procedure of blade abrasion of high-temperature warm air machine |
| CN105127663A (en) * | 2015-08-24 | 2015-12-09 | 武汉理工大学 | Remanufacturing technology for pulverizer exhauster impeller of boiler |
| CN105252202A (en) * | 2015-09-24 | 2016-01-20 | 共享铸钢有限公司 | Repair welding reworking method for crack defects of flange disc casting with rib plate |
| CN105328396B (en) * | 2015-11-26 | 2017-09-12 | 沈阳黎明航空发动机(集团)有限责任公司 | A kind of compressor stator blade unit replacement blade restorative procedure |
| CN105328396A (en) * | 2015-11-26 | 2016-02-17 | 沈阳黎明航空发动机(集团)有限责任公司 | Blade replacement and repair method for stator blade assemblies of gas compressors |
| CN105643183A (en) * | 2015-12-24 | 2016-06-08 | 甘肃银光化学工业集团有限公司 | Method for repairing fracture of liquid ring type compressor impeller under strong acid working condition |
| CN105643183B (en) * | 2015-12-24 | 2017-09-12 | 甘肃银光化学工业集团有限公司 | The restorative procedure of liquid-piston compressor impeller fragmentation under a kind of strong acid operating mode |
| CN105945508A (en) * | 2016-06-27 | 2016-09-21 | 攀钢集团工程技术有限公司 | Online repairing method for impeller of circulating fan |
| CN109014458A (en) * | 2018-09-21 | 2018-12-18 | 贵州凯阳航空发动机有限公司 | A kind of cutting method of aircraft engine blade |
| CN109014458B (en) * | 2018-09-21 | 2021-02-09 | 贵州凯阳航空发动机有限公司 | Cutting method of aircraft engine blade |
| CN114083224A (en) * | 2021-11-26 | 2022-02-25 | 国网四川省电力公司映秀湾水力发电总厂 | Repair method for fixed guide vane of mixed-flow water turbine |
| CN114918628A (en) * | 2022-06-20 | 2022-08-19 | 江苏金通灵鼓风机有限公司 | Manufacturing method of large closed tungsten carbide abrasion-proof impeller |
| CN114918628B (en) * | 2022-06-20 | 2023-09-15 | 江苏金通灵鼓风机有限公司 | Manufacturing method of large closed tungsten carbide wear-resistant impeller |
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| Publication number | Publication date |
|---|---|
| CN100484690C (en) | 2009-05-06 |
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Owner name: JILIN ELECTRIC POWER RESEARCH INSTITUTE CO., LTD. Effective date: 20121109 Owner name: ELECTRIC POWER RESEARCH INSTITUTE OF JILIN ELECTRI Free format text: FORMER OWNER: CHANGCHUN ANXIN ELECTRIC POWER TECHNOLOGY CO., LTD. Effective date: 20121109 |
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Effective date of registration: 20121109 Address after: 130021 Jilin City, Changchun province people's street, No. 4433 Patentee after: Electric Power Research Institute of Jilin Electric Power Company Patentee after: Jilin Academy of Electric Power Science Patentee after: State Grid Corporation of China Address before: 130012 No. three, No. 146, software development zone, Changchun hi tech Zone, Jilin Patentee before: Changchun Anxin Electric Power Technology Co., Ltd. |